html,
body {
	width: 100%;
	height: 100%;
	font-family: "Microsoft YaHei", sans-serif;
	position: relative;
	overflow: hidden;
	background: #000 !important;
}

.buttons {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
}

.row {
	display: flex;
	justify-content: center;
	align-items: center;
}